Pressure roller reel-up

ABSTRACT

The pressure roller reel-up for reeling of a web (W) onto a roll (R) contains a roller ( 1 ) via which the continuous web (W) entering the reel-up is arranged to wind around a reeling axle ( 3 ) arranged rotatably in a reeling position. The reel-up also comprises a load device ( 4 ) for pressing the roller ( 1 ) against a roll (R) being formed of the web around the reeling axle ( 3 ) in order to form a reeling nip (N) between the roller ( 1 ) and the roll (R). The roller ( 1 ) is inside a belt loop ( 2 ) laid against the periphery of the roll (R) within a given path length (L) after the reeling nip (N) formed between the roller ( 1 ) and the roll (R).

FIELD OF THE INVENTION

The present invention relates to a pressure roller reel-up of the typehaving a roller on which a continuous web entering the reel-up is wound.

BACKGROUND OF THE INVENTION

To accumulate a continuous web, such as a paper web onto a roll a rollerover which the web entering the reel-up curves is used in reel-ups. Atthe same time the roller is in contact with the roll which builds uparound the reel spool, and it is loaded against this roll with asuitable force by means of a loading device.

A kind of a pressure roller reel-up is known for instance from the FIpatent 71709. In this the roller, which guides the continuous paper webor the like, is pressed with a suitable loading force against the rollformed of the web.

The problem with pressure roller reel-ups is the high linear load whichis due to the structure of the nip of the pressure roller that falls inthe same size category with the reel spool, which linear loadcomplicates the reeling process and may have a negative effect on thequality of the roll that is being formed. On the other hand, by means ofpressure roller reel-ups it is possible to effectively control the airflows before the reeling nip.

OBJECTS AND SUMMARY OF THE INVENTION

The purpose of the invention is to present a pressure roller reel-up bymeans of which it is possible to control the reeling process moreeffectively with respect to the load as well. To attain this purpose,the pressure roller reel-up according to the invention is primarilycharacterized in what will be presented in the characterizing part ofthe appended claim 1. Together with a belt loop the roller constitutes astructure which guides the web running to the reel-up and presses theweb against the roll. Thus, the belt which is situated against the rollwithin a given length and also participates in the loading with a setsurface pressure, generates an extended nip, i.e. the load is not thelinear load determined by the pressure roller. Thus, the belt whichfunctions as an extension for the nip, contributes to the optimalstructure of the roll. It is possible to affect the reeling with anumber of variables, such as for example the length and/or tension ofthe belt section positioned against the roll.

As for the other preferred embodiments of the invention, reference ismade to the appended dependent claims and to the descriptionhereinbelow.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following, the invention will be described in more detail withreference to the appended drawing, in which

FIG. 1 shows a side view of the roller reel-up in the beginning of thereeling when the roll is in a reeling position, and

FIG. 2 shows a roller reel-up when the roll is in a change position.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a pressure roller reel-up which is arranged to reel acontinuous paper web W, or the like onto a roll R. The continuouslygrowing roll R builds up around a reel spool, i.e. reeling axle 3arranged rotatable in the frame (not shown) of the reel-up. According tothe principle of the pressure roller reel-up, the reeling axle 3 remainsstationary in the reel-up during the reeling as the frame of the reel-upreceives the weight of the roll itself as well as the weight caused bythe load, but structurally the reeling axle 3 can be located in a part,such as a carriage, or the like, arranged movable in the frame of thereel-up 3 and enabling the transfer of the full roll to an. exit point,and in this context, these structures known as such in connection withthe reel-ups, are not described in more detail.

The paper web W or the like is passed onto the roll R via a reeling nipN, which is formed between a roll 1 and the roll R, the roller 1 beingloaded over the full width of the roll. Before the reeling nip N, theweb curves on the periphery of the roller 1 within a given sectordetermined by the location of the guide roller 6 preceding the roller 1.

Around the roller 1, a belt loop 2 is tensioned, and thus the reelingnip N which presses the web W against the preceding layers of the rollR, is, in a way, formed between the belt laid on top of the mantlesurface of the roller 1 and the roll R. In the travel direction of theweb after the roller 1 the web W is pressed against the preceding layersof the roll R by the belt of the belt loop 2 within a given path lengthL. The belt travels at the same web running speed with the web W. Thebelt loop 2 is at least equal in width with the entire roll, and it ispositioned against the periphery of the roll R within a given wraplength so that it guides the on-coming web W on top of the precedinglayers of the roll R formed of the web. Also the belt causes load on theroll, and thus the reeling nip in question is an extended reeling niplocated within the path length L in the circumferential direction of theroll R.

That section of the belt loop 2, which is positioned against the roll R,is determined by the roller 1 which forms the actual reeling nip N andby a second roller 7 located in the travel direction of the belt afterthe roller 1, which second roller 7 turns the travel of the belt in thebelt loop towards the first roller 1. The belt of the belt loop 2 leavesthe roll R and is guided to the the second roller 7, which is off theroll R, in other words the belt travels a short distance freely from theroll R to the second roller 7. Furthermore, there may be other rollersinside the belt loop 2, for example within the reversing section fromthe roller 7 to the roller 1. Such a roller can be used for example as atension roller to adjust the tension of the belt if the rollers 1 and 7have a fixed position. Naturally, at least one of the rollers 1 and 7can also be arranged adjustable in its position in the supportingstructure to adjust the tension of the belt and/or the wrap length L.Such a roller can be arranged for example in a swinging arm structure,which is pivoted on the structure supporting the rollers and the belt,to turn in a plane perpendicular to the axis of rotation of the roller,or it can be arranged to be moved along guides provided in thisstructure at the ends of the roller.

The belt loop 2 is advantageously driven, wherein one of the rollerslocated therein, advantageously the roller 1 forming the reeling nip N,is driven.

As can be seen in FIG. 1, when the thickness of the roll R increases inthe radial direction, the roller 1 and the reeling axle 3 move furtherapart from each other. In practice this is achieved in such a way thatthe structure supporting the roller 1 and the belt loop 2 around theroller 1 is movable while the reeling axle 3 remains stationary in theframe of the reel-up in the reeling position. Furthermore, in FIG. 1,dashed lines illustrate a situation where the roll R has been reeledinto its full size, When the diameter of the roll R increases, the wraplength L on the roll R is increased, if the position of the rollersguiding the belt inside the belt loop is not changed. As was statedabove, the geometry and the wrap length L of the belt loop can beadjusted by arranging at least one of the rollers 1 and 7 in such a waythat it can be moved in a direction perpedicular to its axis in thestructure supporting the rollers.

The structure supporting the rollers 1, 7 and the belt loop 2 isarranged to be loaded by means of a loading device 4 in such a way thata suitable loading force is effective in the reeling nip N and in thesection of the belt loop 2 succeeding the reeling nip N. The magnitudeof the loading force effected by the loading device is adjustable, andit can vary within the scope of a suitable program while the reelingproceeds. The loading device comprises at least a transfer device 4 awith which it is possible to move the structure supporting the rollersand the belt loop in the radial direction with respect to the reelingaxle 3, and on the other hand a power unit 4 b, such as a hydrauliccylinder, by means of which it is possible to load this transfer device4 a against the roll R with a desired, adjustable force in the directionof the aforementioned transfer movement. The transfer device 4 a can bea unit which travels along a linear path in linear motion guides andincludes a structure supporting the rollers 1, 7 and the belt loop 2,or, as shown in FIG. 1, a swinging arm which is arranged pivotable inthe plane of rotation of the reeling axle 3 and whose pivotal axis islocated in such a way with respect to the reeling axle 3 that the rollerand the belt are placed against the roll R from the side. In FIG. 1, thepivotal axis A is located underneath the level of the reeling axle 3aside from the vertical plane extending via the reeling axle, and on thesame side of the vertical plane where the roller 1 and the belt loop 2are situated. The power unit 4 b is arranged to move the swinging armtowards the roll R in order to produce a load. Furthermore, FIG. 1 showsa guide roller 6 which is included in the movable transfer device 4 aand precedes the belt loop 2 in the travel direction of the web W andguides the web entering the reel-up onto the roller 1. The guide rolleris advantageously a spreader roller.

The reeling axle 3 is driven, and thus it is possible to rotate the rollR at a speed required by the web running speed during the entire reelingprocess at least until the web W passed onto the roll is cut off.

In FIG. 1, dashed lines illustrate a second belt loop 5, having at leastthe width of the roll R and containing a roller 5 a which, together withthe belt travelling on top of it, forms a nip N′ against the roll R.This belt loop 5 can also be loaded against the roll R with a desiredforce. This second belt loop 5 can be freely rotatable or driven, andits signifigance is disclosed in the description hereinbelow withreference to FIG. 2.

FIG. 2 illustrates a situation where the roll R has become full in thereeling position, and it has been moved further apart from the transferdevice 4 a and off the belt loop 2 along a schematically shown,substantially horizontal transfer path 8. At this final stage, the beltloop 5 which touches the roll R. guides the free run of the web W passedfrom the roller 1 against the preceding layers of the roll R, andprevents the access of air between the web W and the roll R. The beltloop 5 can be arranged movable with respect to the reeling axle 3, sothat it can be accelerated to the web running speed when desired andmoved in contact with the outer surface of the roll R. The belt loop 5can be arranged to move along with the motion of a transfer device suchas a carriage or the like which moves the reeling axle 3 from thereeling position of FIG. 1 to the change position of FIG. 2, and thebelt loop can be for example fixed to the transfer device.

Furthermore, FIG. 2 shows a change situation, where a new reeling axle 3a is brought from above in between the old roll R which is in the changeposition and the belt loop 2, onto the support of the frame of thereelup, the new reeling axle 3 a being in contact with the free run ofthe web W which travels onto the roll R from the roller 1. Now theroller 1 and the belt loop 2 can be brought into contact with thereeling axle 3 by means of the transfer device 4 a, to form the reelingnip N. in other words in such a way that the web W travels through thenip formed by the belt on the roller 1 and the reeling axle 3.Thereafter the web W can be cut off and its forward end can be guided towind around the new reeling axle 3 a, and further under the nip with amethod known as such which will not be described in more detail in thiscontext. After the cut-off operation, the rotational motion of thereeling axle is brought to a stop slowly by means of its centre drive.Because the belt loop 5 still binds the surface layers of the web W inthe roll, there is no danger that the roll might become slackened. Theslow stop reduces the risk of unrolling especially in the case of coatedand calendered paper grades.

By means of the second belt loop 5 it is possible to attain the sameeffect as with the device presented in the international publication WO95/34495.

The roller 1 forming the actual reeling nip N and the belt loop 2 of theroller 1 are arranged in contact with the roll R from the side. The areaof contact is preferably located inside a sector that extends between 0°and 180° in the direction of rotation of the roll R when measured fromthe uppermost point of the rotating movement. As the reeling processproceeds, the reeling nip N formed by the roller I is located preferablyin the area between 0° and 90°. Correspondingly, the second belt loop 5touches the roll R from underneath. The area of contact where the beltloop rests against the roll R, is located inside a sector that extendsbetween 90° and 270° in the direction of rotation of the roll R whenmeasured from the uppermost point of the rotating movement, and thereeling nip N′ located by the roller 5 a is preferably in the areabetween 110° and 180°. Naturally, the belt loops 2 and 5 are placed insuch a way that they can simultaneously be in contact with the roll Rshortly before the roll R is detached from the nip contact with theroller 1 in order to move the full roll R into the change position. Thesecond belt loop 5, the so-called “change belt”, does not have strictsequence time requirements, and it can be brought in contact with theroll R at an early stage.

The invention is suitable for all pressure roller reel-ups for web-likematerials, especially for paper web reel-ups. The term paper web refersto all such materials in the form of a continuous web which are formedfrom a fibrous pulp in a paper or board machine and in the reeling ofwhich the invention can be applied, irrespective of the raw materialfibres or the grammage.

The belts in the belt loops 2 and 5 have a surface material whosefriction with the web material to be reeled is sufficient. Furthermore,the inner surfaces of the belts can be provided with materials orstructures which increase the hold with the rollers. One or both of thebelt loops may comprise two or more belts side by side instead of onewide belt.

What is claimed is:
 1. A pressure roller reel-up comprising: a reelingaxle around which a continuous web is wound to form a roll; a firstroller around which said continuous web passes prior to reaching saidreeling axle; a loading device for enabling the movement of said firstroller from a position spaced from said roll to a position in abutmentwith said roll being formed to thereby define a reeling nip between saidfirst roller and the roll being formed; a belt arranged around saidfirst roller and a second roller to form a first belt loop, said firstbelt loop being structured and arranged so that when said first rolleris placed against said roll said belt is placed against a periphery ofsaid roll along between said first roller and said second roller aperipheral distance L of said roll after said reeling nip.
 2. Thepressure reel-up according to claim 1, further comprising means fordriving said first belt loop.
 3. The pressure reel-up according to claim1, further comprising a second belt loop structured and arranged to bemovable from a position spaced from said roll to a position in abutmentwith said roll.
 4. The pressure reel-up according to claim 3 whereinsaid second belt loop passes around a roller which forms a nip with theroll in said position in abutment with said roll.
 5. The pressure reelup according to claim 3, wherein said second belt loop contacts saidroll from underneath said roll within a sector which in the direction ofrotation of the roll is between 90° and 270° when measured from theuppermost point of the movement of rotation.
 6. The pressure reel-upaccording to claim 1, wherein said loading device comprises a transferdevice having a first end to which is coupled to said first and secondroller and a pivotally mounted second end permitting the arcuatemovement of said first end of said transfer device.
 7. The pressure reelup according to claim 6, wherein said loading device is a swing arm. 8.The pressure reel up according to claim 6, wherein a position of atleast one of said first and second rollers is adjustable in saidtransfer device.
 9. The pressure reel up according to claim 1, furthercomprising a new reeling axle moveable to a position between said rolland said first belt loop when said first roller is spaced from saidroll, and when said new reeling axle is placed in said position betweensaid roll and said first belt loop said new reeling axle is placedcontact with a run of the web traveling between said roll and said firstbelt loop.
 10. The pressure reel up according to claim 1, wherein whensaid first roller is placed in abutment with said roll said first beltloop is placed in contact with said roll from the side inside a sectorwhich in the direction of rotation of the roll is between 0° and 180°when measured from an uppermost point of the rotating movement.
 11. Thepressure reel up according to claim 1, further comprising means fordriving said reeling axle.
 12. A method for reeling a web in a pressureroller reel-up comprising the steps of: winding the web around a reelingaxle to form a roll; adjusting a position of a belt loop having a beltand a first and second roller to a position wherein said first roller isplaced in abutment with said roll to define a reeling nip and said beltis laid against a periphery of said roll from said first roller along alength L of said periphery of said roll; applying a loading force tosaid roll by means of said belt loop, said loading force effective atsaid reeling nip and along said length L.
 13. The method according toclaim 12, further comprising adjusting a geometry of said belt loop bymoving one of said first and second rollers.
 14. The method according toclaim 12, further comprising: moving a full roll away from said beltloop while said web is running on to said full roll; positioning a newreeling axle into contact with a free run of the web between said beltloop and said full roll; positioning said first roller so that the webtravels between said first roller and said new reeling axle; cutting theweb at a forward end thereof and guiding said forward end to wind aroundsaid new reeling axle.
 15. The method according to claim 14, furthercomprising positioning a second belt loop in contact with said full rolland applying a force to said full roll via said second belt loop to stopthe rotation of said full roll.